package com.example.fragmentbestpractice;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class NewsTitleFragment extends Fragment {

    //判断是单页还是双页（手机还是平板）
    private boolean isTwoPane;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view=inflater.inflate(R.layout.news_title_frag,container,false);
        RecyclerView newsTitleRecyclerView=view.findViewById(R.id.news_title_recycler_view);
        LinearLayoutManager layoutManager=new LinearLayoutManager(getActivity());
        newsTitleRecyclerView.setLayoutManager(layoutManager);
        NewsAdapter adapter =new NewsAdapter(getNews());
        newsTitleRecyclerView.setAdapter(adapter);
        return view;
    }

    //生成新闻标题、内容
    private List<News> getNews() {
        List<News> newsList=new ArrayList<>();
        for (int i=1;i<=50;i++){
            News news=new News();
            news.setTitle("标题"+i);
            news.setContent(getRandomLengthContent("内容"+i)+".");
            newsList.add(news);
        }
        return newsList;
    }

    private String getRandomLengthContent(String content){
        Random random=new Random();
        int length=random.nextInt(200)+1;
        StringBuilder builder=new StringBuilder();
        for (int i=0;i<length;i++){
            builder.append(content);
        }
        return builder.toString();
    }

    public void onActivityCreated(Bundle savedInstanceState){
        super.onActivityCreated(savedInstanceState);
        if(getActivity().findViewById(R.id.news_content_layout)!=null){
            isTwoPane=true;//双页
        }else {
            isTwoPane=false;//单页
        }
    }

    class NewsAdapter extends RecyclerView.Adapter<NewsAdapter.ViewHolder>{

        private List<News> mNewsList;

        public class ViewHolder extends RecyclerView.ViewHolder {
            TextView newsTitleText;
            public ViewHolder(@NonNull View itemView) {
                super(itemView);
                newsTitleText=itemView.findViewById(R.id.news_title);
            }
        }

        public NewsAdapter(List<News> newsList){
            mNewsList=newsList;
        }

        @NonNull
        @Override
        public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
            View view=LayoutInflater.from(parent.getContext()).inflate(R.layout.news_item,parent,false);
            final ViewHolder holder=new ViewHolder(view);
            view.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    News news=mNewsList.get(holder.getAdapterPosition());
                    if(isTwoPane){
                        //如果双页模式，刷新NewsContentFragment的内容；
                        NewsContentFragment newsContentFragment= (NewsContentFragment) getFragmentManager().findFragmentById(R.id.news_content_fragment);
                        newsContentFragment.refresh(news.getTitle(),news.getContent());
                    }else {
                        //如果单页模式，直接启动NewsContentActivity
                        NewsContentActivity.actionStart(getActivity(),news.getTitle(),news.getContent());
                    }
                }
            });

            return holder;
        }

        @Override
        public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
            News news=mNewsList.get(position);
            holder.newsTitleText.setText(news.getTitle());

        }

        @Override
        public int getItemCount() {
            return mNewsList.size();
        }


    }
}
